22 D. K. Greger — Devonian of Central Missouri. 



bonopsis providencis (Broadhead), and a fragmentary 

 Gomphoceras sp. being the only forms recorded. 



Section in Boone county, Sect. 28, Twp. 47, Range 13 

 West: Exposures of the Cooper in Boone connty are 

 confined to the Missouri River blnffs in the vicinity of 

 Providence. The locality where the following section 

 was measured is probably the most interesting exposure 

 of Devonian rocks in Missouri, there being four marked 

 unconformities (= disconformities) within a vertical dis- 

 tance of less than 20 feet. 



SaUcuwat^ 



Soojptr 



Co^lomerota 



3^^ow fcity. 



Callaway-Cooper-Jefferson City unconformities, Sect. 15, Twp. 47, Eange 

 14 West, Moniteau Co. 



Mississippian, Chouteau limestone. ft. in. 



No. 6. Yellow, shaly limestones and thin beds of shale . . 60 

 No. 5. Thin sandy layer, blue and green, sometimes 



quite soft 7 



Unconformity. 



Devonian, Craghead Creek shale. 



No. 4. Gray, sandy shale 4 



Unconformity. 



Devonian, Callaway limestone. 



No. 3. Brown, earthy limestones, f ossilif erous 3 



Unconformity. 



Devonian, Cooper limestone. 



No. 2. Gray and blue, heavy-bedded limestones, fossil- 



iferous 12 



Unconformity. 



Ordovieian, Jefferson City formation. 



No. 1. Buff, dolomitic limestones 9+ 



